Cheat Notes:
*Alternate Donatello costume: Hold L or R when selecting Donatello at the character selection screen.*Alternate Leonardo costume: Hold L or R when selecting Leonardo at the character selection screen.*Alternate Michaelangelo costume: Hold L or R when selecting Michaelangelo at the character selection
screen.*Alternate Raphael costume: Hold L or R when selecting Raphael at the character selection screen.*Halloween costumes: The turtles will
have pumpkins on their heads.*Master Splinter: Master Splinter will be unlocked
in story mode.
UNLOCKING HINTS
Unlock the Challenge mode: Complete story mode as Raphael, Donatello,
Michaelangelo, and Leonardo.Unlock Casey Jones: Complete level 1 as Raphael to unlock
Casey Jones in versus mode. He does not have any Dojo missions
in his story and does not get nearly as many intermission sequences
as the turtles, but he is much stronger. Also, you cannot have
another player play as your "assist" character when
you are Casey Jones. He is the best all-around single player character,
as he takes out most enemies with a single hit.
Unlock the Evil Turtlebot: Complete level 3 as Raphael, Donatello,
Michaelangelo, or Leonardo to unlock the Evil Turtlebot in versus
mode.Unlock Hun: Complete level 6 as Michaelangelo to unlock
Hun in versus mode.Unlock Oroku Saki: Defeat Saki as Raphael, Donatello, Michaelangelo, or
Leonardo to unlock Oroku Saki in versus mode.Unlock Shredder: Defeat Shredder as Raphael, Donatello, Michaelangelo,
or Leonardo to unlock Shredder in versus mode.Unlock Splinter: Complete Dojo level 3 as Leonardo to unlock
Splinter in versus mode.Unlock Yoshi Hamato: Complete Challenge Mode as Raphael, Donatello,
Michaelangelo, or Leonardo to unlock Yoshi Hamato in versus mode.

Submitted by: Big 'H', Phoebe Harris, CheatBookJon and Aaron
Jeffries and many others with the same/similar info - Thank you